To make a mortal accident a light accident by absorbing the speed of a vehicle by an air cushion.

At the time of finding an obstruction or the like in front of a vehicle during travel, in order to avoid the danger of a collision, a large air cushion is made appear at the front face of the vehicle, and collision impact is absorbed to reduce damage. The best shape and material of a bag are selected by computer calculation, and air bag technique is applied to bag expanding technique. The number of bags is determined on the basis of experimental data. The number of traffic deaths, 10,000 a year, can be reduced to a half or less.